put ftemplate directive info under directives; new version of ftemplate, with LOOPS!

doc/ikiwiki/directive/ftemplate.mdwn

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+The `ftemplate` directive is supplied by the [[!iki plugins/contrib/ftemplate desc=ftemplate]] plugin.
+
+This is like the [[ikiwiki/directive/template]] directive, with the addition
+that one does not have to provide all the values in the call to the template,
+because ftemplate can query structured data ("fields") using the
+[[plugins/contrib/field]] plugin.
+
+Templates are files that can be filled out and inserted into pages in
+the wiki, by using the ftemplate directive. The directive has an id
+parameter that identifies the template to use.
+
+Additional parameters can be used to fill out the template, in
+addition to the "field" values.  Passed-in values override the
+"field" values.
+
+There are two places where template files can live.  One is in the /templates
+directory on the wiki.  These templates are wiki pages, and can be edited from
+the web like other wiki pages.
+
+The second place where template files can live is in the global
+templates directory (the same place where the page.tmpl template lives).
+This is a useful place to put template files if you want to prevent
+them being edited from the web, and you don't want to have to make
+them work as wiki pages.
+
+### EXAMPLES
+
+#### Example 1
+
+PageA:
+
+    \[[!meta title="I Am Page A"]]
+    \[[!meta description="A is for Apple."]]
+    \[[!meta author="Fred Nurk"]]
+    \[[!ftemplate id="mytemplate"]]
+
+Template "mytemplate":
+
+    # <TMPL_VAR NAME="TITLE">
+    by <TMPL_VAR NAME="AUTHOR">
+
+    **Summary:** <TMPL_VAR NAME="DESCRIPTION">
+
+This will give:
+
+    <h1>I Am Page A</h1>
+    <p>by Fred Nurk</p>
+    <p><strong>Summary:</strong> A is for Apple.
+
+#### Example 2: Overriding values
+
+PageB:
+
+    \[[!meta title="I Am Page B"]]
+    \[[!meta description="B is for Banana."]]
+    \[[!meta author="Fred Nurk"]]
+    \[[!ftemplate id="mytemplate" title="Bananananananas"]]
+
+This will give:
+
+    <h1>Bananananananas</h1>
+    <p>by Fred Nurk</p>
+    <p><strong>Summary:</strong> B is for Banana.
+
+#### Example 3: Loops
+
+(this example uses the [[plugins/contrib/ymlfront]] plugin)
+
+Page C:
+
+    ---
+    BookAuthor: Georgette Heyer
+    BookTitle: Black Sheep
+    BookGenre:
+      - Historical
+      - Romance
+    ---
+    \[[ftemplate id="footemplate"]]
+
+    I like this book.
+
+Template "footemplate":
+
+    # <TMPL_VAR BOOKTITLE>
+    by <TMPL_VAR BOOKAUTHOR>
+
+    <TMPL_IF BOOKGENRE>(
+    <TMPL_LOOP GENRE_LOOP><TMPL_VAR BOOKGENRE>
+    <TMPL_UNLESS __last__>, </TMPL_UNLESS>
+    </TMPL_LOOP>
+    )</TMPL_IF>
+
+This will give:
+
+    <h1>Black Sheep</h1>
+    <p>by Georgette Heyer</p>
+
+    <p>(Historical, Romance)</p>
+
+    <p>I like this book.</p>
+
+### LIMITATIONS
+
+One cannot query the values of fields on pages other than the current
+page.  If you want to do that, check out the [[plugins/contrib/report]]
+plugin.